ipc/glue/SharedMemoryBasic_mach.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_ipc_SharedMemoryBasic_mach_h
   8 #define mozilla_ipc_SharedMemoryBasic_mach_h
   9
  10 #include "base/process.h"
  11
  12 #include "mozilla/UniquePtrExtensions.h"
  13 #include "mozilla/ipc/SharedMemory.h"
  14 #include <mach/port.h>
  15
  16 #ifdef FUZZING
  17 #  include "mozilla/ipc/SharedMemoryFuzzer.h"
  18 #endif
  19
  20 //
  21 // This is a low-level wrapper around platform shared memory.  Don't
  22 // use it directly; use Shmem allocated through IPDL interfaces.
  23 //
  24
  25 class MachPortSender;
  26 class ReceivePort;
  27
  28 namespace mozilla {
  29 namespace ipc {
  30
  31 class SharedMemoryBasic final
  32     : public SharedMemoryCommon<mozilla::UniqueMachSendRight> {
  33  public:
  34   SharedMemoryBasic();
  35
  36   virtual bool SetHandle(Handle aHandle, OpenRights aRights) override;
  37
  38   virtual bool Create(size_t aNbytes) override;
  39
  40   virtual bool Map(size_t nBytes, void* fixed_address = nullptr) override;
  41
  42   virtual void Unmap() override;
  43
  44   virtual void* memory() const override {
  45 #ifdef FUZZING
  46     return SharedMemoryFuzzer::MutateSharedMemory(mMemory, mAllocSize);
  47 #else
  48     return mMemory;
  49 #endif
  50   }
  51
  52   static Handle NULLHandle() { return Handle(); }
  53
  54   static void* FindFreeAddressSpace(size_t aSize);
  55
  56   virtual bool IsHandleValid(const Handle& aHandle) const override;
  57
  58   virtual Handle CloneHandle() override;
  59
  60   virtual Handle TakeHandle() override;
  61
  62  private:
  63   ~SharedMemoryBasic();
  64
  65   mozilla::UniqueMachSendRight mPort;
  66   // Pointer to mapped region, null if unmapped.
  67   void* mMemory;
  68   // Access rights to map an existing region with.
  69   OpenRights mOpenRights;
  70 };
  71
  72 }  // namespace ipc
  73 }  // namespace mozilla
  74
  75 #endif  // ifndef mozilla_ipc_SharedMemoryBasic_mach_h